Oh I'm sorry for you Machair, it certainly sounds as if the oestrogen crash triggered it. They are living hell there's no doubt about that. When they are at their worst it feels as if your body could not possibly survive such pain. I really feel for you.
I don't want to tempt fate but it's as if a switch has been flicked. They have just disappeared. It is nothing short of miraculous. If I start the day with a mild one, even a Diclofenac will shift it, that has simply never happened before. My social life had returned to full on, thanks to hubby who is making the most of the change in fortunes and inviting all and sundry and filling the diary daily. Have to say it's exhausting but I've spend the best part of the last 16 years not able to leave the house sometimes for weeks at a time. The transformation is unbelievable.
I can't remember the name of the member, I'll try to find it, but she swore by a cooling strip but I can't remember what it was called. Perhaps keep a few in the cupboard if it helped. Over the years I have been gifted all sorts of devices in the hope that a miracle cure might be found. Sadly nothing worked for me but many people seem to get relief from these things. My philosophy is very much, try anything. If something works for you, embrace it, you don't need a scientific analysis or study to confirm what it is or isn't doing!!
Hopefully you'll have a long period of low oestrogen now. It's the crazy surges and falls that really cause the problems, well they certainly did for me. Fingers crossed that you'll have a lovely calm spell xxx